#!/usr/bin/env python

"""
================================================
ABElectronics Expander Pi | Digital I/O Read Demo

Requires python smbus to be installed
For Python 2 install with: sudo apt-get install python-smbus
For Python 3 install with: sudo apt-get install python3-smbus

run with: python demo_ioread.py
================================================

This example reads the first 8 pins of on the Expander Pi Digital I/O
port.  The internal pull-up resistors are enabled so each pin will read
as 1 unless the pin is connected to ground.

"""
from __future__ import absolute_import, division, print_function, \
                                                    unicode_literals
import time
import os

try:
    import ExpanderPi
except ImportError:
    print("Failed to import ExpanderPi from python system path")
    print("Importing from parent folder instead")
    try:
        import sys
        sys.path.append('..')
        import ExpanderPi
    except ImportError:
        raise ImportError(
            "Failed to import library from parent folder")


def main():
    '''
    Main program function
    '''
    iobus = ExpanderPi.IO()

    # We will read the inputs 1 to 16 from the I/O bus so set port 0,
    # port 1 to be inputs and enable the internal pull-up resistors
    iobus.set_port_direction(0, 0xFF)
    iobus.set_port_pullups(0, 0xFF)

    iobus.set_port_direction(1, 0xFF)
    iobus.set_port_pullups(1, 0xFF)

    while True:
        # clear the console
        os.system('clear')

        # read the pins 1 to 16 and print the results
        print('Pin 1:  ' + str(iobus.read_pin(1)))
        print('Pin 2:  ' + str(iobus.read_pin(2)))
        print('Pin 3:  ' + str(iobus.read_pin(3)))
        print('Pin 4:  ' + str(iobus.read_pin(4)))
        print('Pin 5:  ' + str(iobus.read_pin(5)))
        print('Pin 6:  ' + str(iobus.read_pin(6)))
        print('Pin 7:  ' + str(iobus.read_pin(7)))
        print('Pin 8:  ' + str(iobus.read_pin(8)))
        print('Pin 9:  ' + str(iobus.read_pin(9)))
        print('Pin 10: ' + str(iobus.read_pin(10)))
        print('Pin 11: ' + str(iobus.read_pin(11)))
        print('Pin 12: ' + str(iobus.read_pin(12)))
        print('Pin 13: ' + str(iobus.read_pin(13)))
        print('Pin 14: ' + str(iobus.read_pin(14)))
        print('Pin 15: ' + str(iobus.read_pin(15)))
        print('Pin 16: ' + str(iobus.read_pin(16)))

        # wait 0.5 seconds before reading the pins again
        time.sleep(0.1)

if __name__ == "__main__":
    main()